Merge "core_local: local channel data not being properly unref'ed and unlocked"

include/asterisk/core_local.h

@@ -42,36 +42,37 @@ struct stasis_message_type;
 /* ------------------------------------------------------------------- */
 
 /*!
- * \brief Lock the "chan" and "owner" channels (and return them) on the base
+ * \brief Add a reference to the local channel's private tech, lock the local channel's
- *        private structure as well as the base private structure itself.
+ *        private base, and add references and lock both sides of the local channel.
  *
- * \note This also adds references to each of the above mentioned elements and
- *       also the underlying private local structure.
  * \note None of these locks should be held prior to calling this function.
- * \note To undo this process call ast_local_unlock_all.
+ * \note To undo this process call ast_local_unlock_all2.
  *
- * \since 13.8.0
+ * \since 13.17.0, 14.6.0
  *
  * \param chan Must be a local channel
- * \param outchan The local channel's "chan" channel
+ * \param tech_pvt [out] channel's private tech (ref and lock added)
- * \param outowner The local channel's "owner" channel
+ * \param base_chan [out] One side of the local channel (ref and lock added)
+ * \param base_owner [out] Other side of the local channel (ref and lock added)
  */
-void ast_local_lock_all(struct ast_channel *chan, struct ast_channel **outchan,
+void ast_local_lock_all(struct ast_channel *chan, void **tech_pvt,
-			struct ast_channel **outowner);
+	struct ast_channel **base_chan, struct ast_channel **base_owner);
 
 /*!
- * \brief Unlock the "chan" and "owner" channels on the base private structure
+ * \brief Remove a reference to the given local channel's private tech, unlock the given
- *        as well as the base private structure itself.
+ *        local channel's private base, and remove references and unlock both sides of
+ *        given the local channel.
  *
- * \note This also removes references to each of the above mentioned elements and
+ * \note This function should be used in conjunction with ast_local_lock_all2.
- *       also the underlying private local structure.
- * \note This function should be used in conjunction with ast_local_lock_all.
  *
- * \since 13.8.0
+ * \since 13.17.0, 14.6.0
  *
- * \param chan Must be a local channel
+ * \param tech_pvt channel's private tech (ref and lock removed)
+ * \param base_chan One side of the local channel (ref and lock removed)
+ * \param base_owner Other side of the local channel (ref and lock removed)
  */
-void ast_local_unlock_all(struct ast_channel *chan);
+void ast_local_unlock_all(void *tech_pvt, struct ast_channel *base_chan,
+	struct ast_channel *base_owner);
 
 /*!
  * \brief Get the other local channel in the pair.

main/bridge.c

@@ -4276,14 +4276,15 @@ static enum ast_transfer_result attended_transfer_bridge(struct ast_channel *cha
 	BRIDGE_LOCK_ONE_OR_BOTH(bridge1, bridge2);
 
 	if (bridge2) {
+		void *tech;
 		struct ast_channel *locals[2];
 
 		/* Have to lock everything just in case a hangup comes in early */
-		ast_local_lock_all(local_chan, &locals[0], &locals[1]);
+		ast_local_lock_all(local_chan, &tech, &locals[0], &locals[1]);
 		if (!locals[0] || !locals[1]) {
 			ast_log(LOG_ERROR, "Transfer failed probably due to an early hangup - "
 				"missing other half of '%s'\n", ast_channel_name(local_chan));
-			ast_local_unlock_all(local_chan);
+			ast_local_unlock_all(tech, locals[0], locals[1]);
 			ao2_cleanup(local_chan);
 			return AST_BRIDGE_TRANSFER_FAIL;
 		}
@@ -4294,7 +4295,7 @@ static enum ast_transfer_result attended_transfer_bridge(struct ast_channel *cha
 		}
 
 		ast_attended_transfer_message_add_link(transfer_msg, locals);
-		ast_local_unlock_all(local_chan);
+		ast_local_unlock_all(tech, locals[0], locals[1]);
 	} else {
 		ast_attended_transfer_message_add_app(transfer_msg, app, local_chan);
 	}

main/core_local.c

@@ -233,43 +233,39 @@ struct local_pvt {
 	char exten[AST_MAX_EXTENSION];
 };
 
-void ast_local_lock_all(struct ast_channel *chan, struct ast_channel **outchan,
+void ast_local_lock_all(struct ast_channel *chan, void **tech_pvt,
-			struct ast_channel **outowner)
+	struct ast_channel **base_chan, struct ast_channel **base_owner)
 {
 	struct local_pvt *p = ast_channel_tech_pvt(chan);
 
-	*outchan = NULL;
+	*tech_pvt = NULL;
-	*outowner = NULL;
+	*base_chan = NULL;
+	*base_owner = NULL;
 
 	if (p) {
-		ao2_ref(p, 1);
+		*tech_pvt = ao2_bump(p);
-		ast_unreal_lock_all(&p->base, outchan, outowner);
+		ast_unreal_lock_all(&p->base, base_chan, base_owner);
 	}
 }
 
-void ast_local_unlock_all(struct ast_channel *chan)
+void ast_local_unlock_all(void *tech_pvt, struct ast_channel *base_chan,
+	struct ast_channel *base_owner)
 {
-	struct local_pvt *p = ast_channel_tech_pvt(chan);
+	if (base_chan) {
-	struct ast_unreal_pvt *base;
+		ast_channel_unlock(base_chan);
-
+		ast_channel_unref(base_chan);
-	if (!p) {
-		return;
 	}
 
-	base = &p->base;
+	if (base_owner) {
-
+		ast_channel_unlock(base_owner);
-	if (base->owner) {
+		ast_channel_unref(base_owner);
-		ast_channel_unlock(base->owner);
-		ast_channel_unref(base->owner);
 	}
 
-	if (base->chan) {
+	if (tech_pvt) {
-		ast_channel_unlock(base->chan);
+		struct local_pvt *p = tech_pvt;
-		ast_channel_unref(base->chan);
+		ao2_unlock(&p->base);
+		ao2_ref(tech_pvt, -1);
 	}
-
-	ao2_unlock(base);
-	ao2_ref(p, -1);
 }
 
 struct ast_channel *ast_local_get_peer(struct ast_channel *ast)